Facebook and Twitter scored their highest number of visitors ever, according to new data released by ComScore. The numbers are particularly impressive given that many sites usually experience a summer slow down. Facebook ranked #4 with 162 million US visits U.S., behind Google, Yahoo, and Microsoft up from 160 million in June and 157 million in May. Twitter ranked #34 with 32.8 million visitors last month up from 30.6 million in June and 27 million in May. ComScore's Top Sites:

via CNet